Why the need for mouse jigglers and the like? Because as a remote worker you have to be at your laptop the full 8 hours, otherwise you are "slacking off".
In theory, that's an argument for adding a "bathroom break" button to groupware more than for RTO. Managers would get metrics to find employees who misuse the break button in excess of what labor law encourages employers to allow.
Go to the toilet and someone calls? You aren't working. Go to the kitchen for coffee and someone calls? You aren't working.
Ultimately, that depends on the nature of the position. Do you work call center or something else?
You don't answer an email right away? You can guess the answer.
I'm in development, not operations, so my manager tends to be more accepting of my habit of dropping offline for an hour at a time to avoid the 23-minute interruption penalty associated with complex problem-solving.